• 전력전자학회논문지
• /
• 제19권5호
• /
• pp.391-398
• /
• 2014

This paper presents a resonant step-down DC/DC converter to reduce the voltage stresses of a 3-phase inverter module under the three-phase AC utility line condition. Under this condition, a conventional 3-phase inverter module suffers from high voltage stresses as a result of the high rectified DC link voltage; hence, a high-cost high-voltage-rating inverter module must be used. However, using the proposed converter, a low-cost low-voltage-rating inverter module may be adopted to drive the motor even under the 3-phase AC line condition. The proposed converter, which can be realized with small size inductor and low-voltage-rating semiconductor devices, operates at a high-efficiency mode because of the zero-current switching operations of all the semiconductor devices. The operational principles are explained and a design example is provided in the study. Experimental results demonstrate the validity of the proposed converter.

• 한국철도학회논문집
• /
• 제11권4호
• /
• pp.398-403
• /
• 2008

전동차용 견인전동기 시스템은 저항 및 쵸퍼 제어에 의한 직류 전동기 방식에서 인버터 제어에 의한 유도전동기 방식으로 발전하였다. 오늘날 유도전동기 기술은 어느 정도 성숙기에 접어들었지만 최근에는 소음제거, 효율 극대화 및 유지보수 비용 절감 등의 이점이 있는 감속기를 제거한 직접 구동용 영구자석 전동기가 새로이 각광받고 있다. 특히 기계적으로 견고한 매입형 영구자석 동기전동기는 출력/토크 밀도가 높고 약계자 제어성이 우수하며 고효율 운전이 가능하다. 본 논문은 자기적 포화특성이 심한 영구자석 전동기를 대상으로 고급화된 비선형 수치해석 기법을 적용하여 설계된 전동기의 특성해석을 나타낸다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 하계학술대회 논문집 B
• /
• pp.872-874
• /
• 2004

This paper presents a charcteristcic analysis switched reluctance motor (SRM) considering hard chopping and DC link voltage ripple by using time-stepped voltage source finite element method in which the magnetic field is combined with drive circuit. We also examine the influence of freewheeling diodes and DC link voltage ripple on the performance of the SRM such as torque ripples and radial force on the surface of the teeth The freewheeling diodes and DC link voltage ripples must be taken into account in predicted the performance of SRM

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
• /
• pp.1029-1030
• /
• 2006

본 논문에서는 리얼게인사의 DSP를 사용하는 고속설계시스템에 의한 부하토크관측기 및 속도 제어기의 설계에 대하여 소개한다. 고속설계시스템은 CEMTool/SIMTool 소프트웨어 프로그램과 RG-DSPIO 제어보드, AUTOTool 프로그램으로 구성되어 있고 이것을 DC Motor 구동시스템에 사용하였다. SIMTool 블록들을 사용함으로써 짧은 시간동안에 다양한 형태의 제어기를 설계 및 구현할 수 있도록 해주는 장점이 있기 때문에 DC Motor의 부하토크관측기 및 속도제어기를 제어 목적에 따라서 쉽게 설계하고 구현할 수 있다.

• Journal of Power Electronics
• /
• 제14권3호
• /
• pp.541-548
• /
• 2014

This paper presents a simple lead angle adjustment method for brushless DC motors. The proposed method is based on the motor current dynamics analysis during the current commutation interval. With the proposed scheme, the phase current and phase back-EMF voltage are in phase and the BLDC motor and drive system have a high efficiency induced by the reduced copper and conduction losses. Experimental results are shown to validate the proposed method.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
• /
• pp.390-394
• /
• 2001

A dynamic simulation model for the brush less dc (BLDC) motor drives using Matlab is presented. In this model, an entire BLDC motor drive, including power conversion unit, BLDC motor, and speed/torque control system, is investigated. Especially, the PWM inverter is modeled using switching function concept, so that the detailed voltage and current waveforms, such as line-to-line voltages, inverter input current, ac line current, and switch/diode currents, can be obtained and average/rms ratings of the components can be easily calculated. Also, the proposed model is made into modular blocks and it can be easily extended to other ac motor applications with a little modification. The detailed modeling method is explained and its actual implementation is described. The validity of the proposed model is verified by various simulation results.

• Journal of Power Electronics
• /
• 제15권6호
• /
• pp.1559-1566
• /
• 2015

The brushless DC motor (BLDCM) has many advantages. As a result, it is widely used in electric vehicle (EV) drive systems. To improve the reliability of the motor control system, a position sensorless control strategy based on a sliding mode observer (SMO) is proposed. The global fast terminal sliding mode observer (GFTSMO) is proposed to enhance the control performance of the SMO control system. The advantages of the linear sliding mode and the nonsingular terminal sliding mode (NTSM) are combined in the control strategy. The convergence speed of the system state is enhanced. The motor commutation point is obtained with the observation of the back EMF, and the instantaneous torque value of the motor is calculated. Therefore, the position sensorless control of the BLDCM is realized. Experimental results show that the proposed control strategy can improve the convergence speed, dynamic characteristics and robustness of the system.

• Journal of Mechanical Science and Technology
• /
• 제15권7호
• /
• pp.831-838
• /
• 2001

Torque ripple control of brushless DC motor has long been the main issue of the servo drive systems in which the speed fluctuation, vibration and acoustic noise need to be minimized. The vast majority of the methods for suppressing the torque ripple require the Fourier series analysis and either the iterative or least mean square minimization. In this paper, a novel approach based on the d-q-0 reference frame that achieves ripple-free torque control with maximum efficiency is presented. The proposed method optimizes the reference phase current waveforms including even the case of 3-phase unbalanced condition, and the motor winding currents are controlled to track the optimized current waveforms by the delta modulation technique. As a results, the proposed approach provides a simple and yet effectine means for obtaining the optimal motor excitation currents. The validity and applicability of the proposed control scheme are verified through simulations and experimental investigations.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2006년도 전력전자학술대회 논문집
• /
• pp.163-165
• /
• 2006

Electronic throttle control(ETC) is critical to drive ability, fuel economy and emission performance of present day passenger vehicles. Until now, many automobile engineer and company have been development electronic throttle controller and control algorism, such as adaptive control, sliding control, nonlinear and so on. But there are almost electronic throttle control using DC motor or stepping motor. This paper is the design of an electronic throttle controller and electronic throttle valve control using BLDC motor instead of DC motor.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 B
• /
• pp.988-990
• /
• 2000

This paper presents the software control of a brush-less DC motor. Not only speed and current controls but also a real-time identification of the motor parameters can be implemented by software using the digital signal processor (DSP) TMS320F240. The DSP Controller TMS320F240 from Texas Instruments is suitable for a wide range of motor drives. TMS320F240 provides a single chip solution by integrating on-chip not only a high computational power but also all the peripherals necessary for electric motor control. The main benefits are increased system reliability and cost reduction of the overall system. The present paper describes how a speed controlled brushless DC drive can be implemented using TMS320F240.